3-Bromopyridine-Heterogenized Phosphotungstic Acid for Efficient Trimerization of Biomass-Derived 5-Hydroxymethylfurfural with 2-Methylfuran to C₂₁ Fuel Precursor

Figure 9

XRD patterns (a), FT-IR spectra (b), and TGA curves (c) of the recycled (after the fourth run) and fresh 3-BrPyPW catalysts.

(a)

(b)

(c)